Pressure cooker



- referred ocr. 24, 1939 UNITED 4STATI-:s

PATENT.. oFFlca 2,171,123 massima cooxEa Edward n. Wittenberg, Eau claire, wir., assigner to Nationallressure Cooker Company, Eau Claire, Wis., a corporation ofWisconsln Application April 25, 1938,- Serial No. 204,067

'4 claims.

This invention relates to new and useful irnprovementsl in -pressure cookers and more' particularly to a novel means for securing the'.cover in position upon the cooker body.

s It is highly desirable ln devices of this general character, that means be provided whereby the cover cannot accidentally be blown oil the cooker, when thev cover securing means is released while the cooker is under pressure. Various devices l have been developed for this purpose, but most of these are quite expensive and complicated.

. It is therefore an object of the present invention to-provide, incombination with the cover securing means, a simpleand inexpensive device Ik which requires that the cover be moved out of engagement with its seatbefore it can be bodily removedfrom the cooker body, whereby the danger of the cover accidentally being blown oi the cooker, when its securing means is released 20 while the cookeris under pressure, is positively seat and rotated to-a predetermined position,- before it canbe bodily removed from thecooker body.-

Other objects of the invention reside in the unique construction of the means for preventing the cover from lbeing blown oir the cooker, when its securing means is releasedi in the provision of a plurality of bayonet slots in the upper iwall portion of the cooker bodyeach .having a 40 horizontal wall, which walls terminate at one end with a suitable depression adapted'to receive a plurality oi projections provided on the cover, and a downwardly facing horizontalwall beihsprovided over each depressionmpted to 45 be engaged by the projections on the cover, in the event that the cover is released and is forced upwardly by pressurewithin the cooker.

, Other objects yof the invention will appear fromthe following description and accompanysoling' drawing and'will be' pointed out in the annexedclaims.

` InA the'accomponying drawing there has been. disclosed a structin'edesigned to carry out the .various objects of the invention, but it is to bev 55, understood that. the invention is not conned to the exact features shown as various changes maybe made Within the scope of the claims which follow.

- In the drawing:

Figure 1 is a view of a vpressure cooker, par- 5 tially in section, showing the invention embodied in the construction thereof Figure 2 is an enlarged detail sectional view on the line 2- 2 of Figure 4,. showing the cover in sealing engagement with its seat;

' Figure 3 is a detail sectional view on the line 3-3 of ,Figure 5, showing the cover spaced from the seat:

Figure 4 is a detail sectional view on the line 4-4 of Figure 2; and 15 Figure 5 is a similar detail sectional view on theline 5-5 of Figure 3.

In the selected embodiment of the invention vhere shown, there is illustrated in Figure 1, for

purposes of disclosure, a pressure cooker comprising a body 2 having a seat 3 adjacentits upper end adapted to be engaged by the depending iiange I of a suitable cover 5.

'The cooker body 2 is shown provided with v suitable handles 6, land also has a plurality of threaded studs 'i pivotally mounted thereon by suitable pivots 8, VEach stud is provided with a suitable thumb screw or wing nut 9. The cover i is shown provided with a plurality of forked 'lugs li adapted to receive the studs 1, whereby 30 when the wing nuts 9 are relatively rotated in ing the cover from being blown ofi the cooker body, should the thumb screws or wing nuts 9 40 accidentally be' operated to release the cover, when the cooker is under pressure.

The means provided for thus preventing the cover from being accidentally blown off the cooker body is shown comprising a plurality of suit- 1 able recesses, generally indicated by the numeral v I4. These recesses are :provided in the upper wall portion Il of the cooker body, and face inwardly as clearly illustrated in. Figures), and 3.

nach recess nu an upwardly facing horizontal wall portion II, terminating at one end in a depression Il. A downwardly facing horizontal wall portion His provided over each depression II and h ssits end portion Il spaced from the vertical wall I'. ot the recess Il, as clearly illustrated in Figures 4 and 5. The upper horizontal wall portion I1 overhangs a portion of the lower horizontal wall I5.

A plurality of suitable projections or studs,

. generally indicated by the numeral 2|, are provided in the periphery of the depending ilange I of the cover 5. These studs are adapted to be received in the recesses I4 between the vertical4 wall portions I8 and I9.

When the cover is initially placed on the cooker body, the studs 2| of the co'ver will engage the horizontal walls I5 of the recesses I4. Such en gagement of the studs 2l with the walls I5 will prevent the cover from sealingly engaging the seat 3 of the cooker body, whereby an annular gap 20 is provided between the seat 3 and ange 4 of the cover.

Before the cover can be moved into engagement with the seat 3, th'e cover must be rotated to bring thev forked lugs II into registration with the studs l. When this is done, the projections or studs 2| on the cover will drop into the depression I6 of the recesses I4, and thereby permit the cover to move into sealing engagement with the seat 3. The securing bolts or elements 1 are then swung upwardly into engagement with the forked lugs II andthe wing nuts 9 rotated to force the cover into air tight engagement with the seat 3.

When the cover is thus secured in sealing engagement with the seat 3, the projections or studs 2i of the cover will be positioned beneath the horizontal walls I1, as bestshown in Figure 4. When the studs 2| are thus positioned, it will readily be noted that, should the wing nuts 9 be operated to release the cover while the cooker is under pressure, the cover cannot be blown oif the cooker body, as a result of the studs 2l engaging the over-hanging horizontal wall portions Il of the recesses I4.

It will further be noted, by reference to Figures 4 and 5, that before the cover can be bodily removed from the cooker body, it must be rotated to bring the studs 2| into registration with the receiving ends 22 of the recesses I4, as shown in -dotted lines in Figure 5, which will permit the pressure within the cooker body to escape to the atmosphere before the cover canbe bodily removed from the cooker body.

The above described structure is very simple and inexpensive in construction and positively prevents the cover from accidentally being blown off the cooker body, when the wing nuts 9 are actuated to release the cover, as hereinbefcre described.

In Figures l, 2, and 3, I have shown the studs 2| of the cover 5 as beingshouldered and `secured in suitable sockets or apertures 23, provided in the ilange 4 of the cover. It is to be understood that these-studs may be otherwise secured to the cover without departing from the scope of the invention. f

I claim as m'yinvention:

1. In a pressure, cooker, a body having a -seat therein, a cover adapted lto sealingly engage' said seat, said body having in its upper portion a plurality of Z-shaped slots, each provided with a -horizontal'wall terminating in an oset portion,

projections onthe cover adapted to be received in slots, when the cover is placed on the cooker body, said horizontal walls being so positioned4 with respect to said seat as to intercept said projections and prevent the cover from sealingly engaging said seat until it has .been rotated to bring said projections into said oiset portions, and means adjacent said offset portions adapted 4to intercept said projections upon the unseating of said cover, to prevent the latter from being blown oif. 1

2. In a pressure cooker, a body having a seat therein, a cover adapted to sealingly engage said seat, cover-securing means, said body having a plurality of recesses in its upper marginal wall each provided with a lower horizontal wall portion, which wall portions terminate at one end with a depression, projections on'the cover adapted to be received in said recesses, said lower wall the cooker, when .the cover securing means is ac.-

tuated to release the cover while the cooker is under pressure.

3. A pressure cooker comprising two members,

one serving as the body of the cooker and the other 4as the cover, the body member having a 'portions being positioned tobe engaged by said seat adapted to be engaged by the cover member, a plurality of recesses in one of said members each provided with asubstantially horizontal wall portion terminating in an offset portion, a plurality of projections on the other member each adapted to be received in one of said recesses, when said members are secured together in operative relation, said projections and horizontal wall portions preventing the cover member from sealingly engaging said seat until the cover member has been rotated to bring said projections adjacent said offset portion, means for securing the cover in xed position on the body member, and means cooperating with said projections toprevent the cover from accidentally being blown' olf the cooker, if the cover is inadreleased from the cooker.

4. A pressure cooker comprising a receptacle 1 open at the top, a cover for said receptacle, sealing members on said receptacle and cover adapted to eiect a seal between said receptacle and cover when the cover is urged toward the receptacle and the sealing membersare engaged and Y to 4break the seal when the cover is moved away from the receptacle, and the sealing members disengaged, said receptacle and cover having juxtaposed parts, an abutment onone 'of said parts, and a finger on the other of said parts 

